TSB41AB2, TSB41AB2I

IEEE 1394a2000 TWOPORT CABLE

TRANSCEIVER/ARBITER

SLLS424G − JUNE 2000 − REVISED DECEMBER 2004

12

POST OFFICE BOX 655303

electrical characteristics over recommended ranges of operating conditions (unless otherwise

noted)

driver

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

VOD

Differential output voltage

56

Ω, see Figure 1

172

265

mV

IDIFF

Driver difference current, TPA+, TPA−, TPB+, TPB−

Drivers enabled, speed

signaling off

− 1.05†

1.05†

mA

ISP200

Common mode speed signaling current, TPB+, TPB−

S200 speed signaling enabled

− 4.84‡

− 2.53‡

mA

ISP400

Common mode speed signaling current, TPB+, TPB−

S400 speed signaling enabled

− 12.4‡

− 8.1‡

mA

VOFF

Off state differential voltage

Drivers disabled, See Figure 1

20

mV

† Limits defined as algebraic sum of TPA+ and TPA− driver currents. Limits also apply to TPB+ and TPB− algebraic sum of driver currents.

‡ Limits defined as absolute limit of each of TPB+ and TPB− driver currents

receiver

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

zid

Differential impedance

Drivers disabled

4

7

k

Ω

zid

Differential impedance

Drivers disabled

4

pF

zic

Common-mode impedance

Drivers disabled

20

k

Ω

zic

Common-mode impedance

Drivers disabled

24

pF

VTH−R

Receiver input threshold voltage

Drivers disabled

−30

30

mV

VTH−CB

Cable bias detect threshold, TPB cable inputs

Drivers disabled

0.6

1

V

VTH+

Positive arbitration comparator threshold voltage

Drivers disabled

89

168

mV

VTH−

Negative arbitration comparator threshold

voltage

Drivers disabled

− 168

−89

mV

VTH−SP200

Speed signal threshold

TPBIAS−TPA common-mode voltage,

drivers disabled

49

131

mV

VTH−SP400

Speed signal threshold

TPBIAS−TPA common-mode voltage,

drivers disabled

314

396

mV